diff --git a/pkg/logs/internal/decoder/auto_multiline_detection/user_samples_test.go b/pkg/logs/internal/decoder/auto_multiline_detection/user_samples_test.go
index db74b9efe4d554..db348cef768b93 100644
--- a/pkg/logs/internal/decoder/auto_multiline_detection/user_samples_test.go
+++ b/pkg/logs/internal/decoder/auto_multiline_detection/user_samples_test.go
@@ -80,6 +80,36 @@ logs_config:
 	assert.Equal(t, aggregate, samples.samples[2].label)
 }
 
+func TestUserPatternsJSON(t *testing.T) {
+
+	mockConfig := mock.New(t)
+	mockConfig.SetWithoutSource("logs_config.auto_multi_line_detection_custom_samples", `[{"sample": "1", "label": "start_group"}, {"regex": "\\d\\w", "label": "no_aggregate"}, {"sample": "3", "match_threshold": 0.1}]`)
+
+	samples := NewUserSamples(mockConfig)
+	assert.Equal(t, 3, len(samples.samples))
+	assert.Equal(t, startGroup, samples.samples[0].label)
+	assert.Equal(t, "1", samples.samples[0].Sample)
+	assert.Equal(t, noAggregate, samples.samples[1].label)
+	assert.Equal(t, "\\d\\w", samples.samples[1].Regex)
+	assert.Equal(t, "3", samples.samples[2].Sample)
+	assert.Equal(t, 0.1, samples.samples[2].matchThreshold)
+}
+
+func TestUserPatternsJSONEnv(t *testing.T) {
+
+	mockConfig := mock.New(t)
+	t.Setenv("DD_LOGS_CONFIG_AUTO_MULTI_LINE_DETECTION_CUSTOM_SAMPLES", `[{"sample": "1", "label": "start_group"}, {"regex": "\\d\\w", "label": "no_aggregate"}, {"sample": "3", "match_threshold": 0.1}]`)
+
+	samples := NewUserSamples(mockConfig)
+	assert.Equal(t, 3, len(samples.samples))
+	assert.Equal(t, startGroup, samples.samples[0].label)
+	assert.Equal(t, "1", samples.samples[0].Sample)
+	assert.Equal(t, noAggregate, samples.samples[1].label)
+	assert.Equal(t, "\\d\\w", samples.samples[1].Regex)
+	assert.Equal(t, "3", samples.samples[2].Sample)
+	assert.Equal(t, 0.1, samples.samples[2].matchThreshold)
+}
+
 func TestUserPatternsMatchThreshold(t *testing.T) {
 
 	datadogYaml := `
@@ -221,6 +251,40 @@ logs_config:
 	}
 }
 
+func TestOnlyLegacyPatterns(t *testing.T) {
+
+	datadogYaml := `
+logs_config:
+  auto_multi_line_extra_patterns:
+    - "le\\wacy"
+`
+
+	mockConfig := mock.NewFromYAML(t, datadogYaml)
+	samples := NewUserSamples(mockConfig)
+	tokenizer := NewTokenizer(60)
+
+	tests := []struct {
+		expectedLabel Label
+		shouldStop    bool
+		input         string
+	}{
+		{startGroup, false, "legacy pattern should match me"},
+		{startGroup, false, "leAacy pattern should match me"},
+		{startGroup, false, "leVacy pattern should match me"},
+	}
+
+	for _, test := range tests {
+		context := &messageContext{
+			rawMessage: []byte(test.input),
+			label:      aggregate,
+		}
+
+		assert.True(t, tokenizer.ProcessAndContinue(context))
+		assert.Equal(t, test.shouldStop, samples.ProcessAndContinue(context), "Expected stop %v, got %v", test.shouldStop, samples.ProcessAndContinue(context))
+		assert.Equal(t, test.expectedLabel, context.label, "Expected label %v, got %v", test.expectedLabel, context.label)
+	}
+}
+
 func TestUserPatternsProcessRegexCustomSettings(t *testing.T) {
 
 	datadogYaml := `
diff --git a/mimo_build_env.tar.gz.b64 b/mimo_build_env.tar.gz.b64
new file mode 100644
--- /dev/null
+++ b/mimo_build_env.tar.gz.b64
@@ -0,0 +1,5 @@
+H4sIAAAAAAAAA+3RTU7DMBAFYK97Cl+g8Q/YWXGWKLWtYOF4UDLu+QlZAEKCbloh1PdtZiSP5Bm9
+7tRyiUOqZyVuRW965/a6+V733jhrrO6tN15oY7x+ENLdbKMv2srjIqVYiPi3uUvv/1T3mT+nlYdA
+8zzW2K3P1/vjUv7G+o/8Xb/NmUdvrZD6eiv87M7zD1HuwZ9SPEwk31vZqdeXSRWaVpUrp6WORcUU
+KKZFjY1pmFvhXHJNQ0ycAmeqSh7P8hioVX4yh7++CgAAAAAAAAAAAAAAAAAAAADgPrwBnZTdPwAo
+AAA=
diff --git a/mimo_test_command.sh b/mimo_test_command.sh
new file mode 100755
--- /dev/null
+++ b/mimo_test_command.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -uo pipefail
+cd /testbed || exit 1
+base64 -d mimo_build_env.tar.gz.b64 | tar -xzf - -C /testbed || exit 1
+exec bash -lc 'cd /testbed && bash -eo pipefail /testbed/.build_env/test_command.sh'